Which J.K. Rowling novel introduced the Triwizard Tournament?

Harry Potter and the Goblet of Fire introduced the Triwizard Tournament in J.K. Rowling’s series. The novel is the fourth book in the seven-part Harry Potter sequence.

The tournament is an international magical competition involving champions from Hogwarts, Beauxbatons Academy, and Durmstrang Institute. Traditionally, three students are selected to complete dangerous tasks, but the Goblet of Fire unexpectedly chooses Harry as a fourth champion alongside Cedric Diggory, Viktor Krum, and Fleur Delacour.

The three tasks involve a lake rescue, a dragon challenge, and a maze. The tournament plot also drives the novel’s darker ending: the maze leads Harry to a portkey and the return of Lord Voldemort. The Triwizard Tournament is therefore both a school spectacle and a major turning point in the series.